Prov. If you say you will do something "one of these days," you probably do not seriously intend to do it, and therefore it will not get done. Alan: When are you going to fix the garage door? Jane: One of these days. Alan: One of these days is none of these days.Jill: One of these days, I'll pay you the money I owe you. Jane: One of these days is none of these days.